Implement Double-Number and String word sets, fix memory panics

Double-Number (19 words): D+ D- DNEGATE DABS D2* D2/ D0= D0< D= D< DU<
  DMAX DMIN D>S M+ M*/ D. D.R 2ROT 2CONSTANT 2VARIABLE 2VALUE 2LITERAL
  Double-number literal parsing (tokens ending with '.')
String (5 words): COMPARE SEARCH /STRING BLANK -TRAILING SLITERAL
Fix all memory access panics with bounds checking throughout host functions.

8 word sets at 100%: Core, Core Ext, Exception, Double, String,
  Search-Order, Memory-Allocation, Programming-Tools

deny.toml

@@ -25,8 +25,22 @@ allow = [
 confidence-threshold = 0.8
 
 [bans]
-multiple-versions = "warn"
+multiple-versions = "deny"
 wildcards = "deny"
+# Transitive duplicates from wasmtime v31 -- will resolve when upgrading
+skip = [
+    "getrandom",
+    "hashbrown",
+    "linux-raw-sys",
+    "object",
+    "rustix",
+    "thiserror",
+    "thiserror-impl",
+    "wasm-encoder",
+    "wasmparser",
+    "wast",
+    "windows-sys",
+]
 
 [sources]
 unknown-registry = "deny"